vulnerability
Arch Linux: Cross-site scripting (CVE-2020-26891)
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 4 | (AV:N/AC:M/Au:N/C:N/I:P/A:N) | Oct 19, 2020 | Jul 11, 2025 | Nov 27, 2025 |
Severity
4
CVSS
(AV:N/AC:M/Au:N/C:N/I:P/A:N)
Published
Oct 19, 2020
Added
Jul 11, 2025
Modified
Nov 27, 2025
Description
A security issue has been found in matrix-synapse before 1.21.0, where HTML pages served via Synapse were vulnerable to cross-site scripting (XSS) attacks.
Solution
arch-linux-upgrade-latest
References
- CVE-2020-26891
- https://attackerkb.com/topics/CVE-2020-26891
- URL-https://github.com/matrix-org/synapse/pull/8444
- URL-https://github.com/matrix-org/synapse/releases/tag/v1.21.2
- URL-https://github.com/matrix-org/synapse/security/advisories/GHSA-3x8c-fmpc-5rmq
- URL-https://matrix.org/blog/2020/10/15/synapse-1-21-2-released-and-security-advisory
- URL-https://security.archlinux.org/ASA-202011-4
- CWE-79
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